Question

I am so confused with this problem, any help would beappreciated.
I've been searching the textbook for somethingsimilar but can't
find anything.

The problem is:

An electron (e= 1.6x10^-19C, m=9.1x10^-31 kg) enters the
regionbetween two capacitor plates with a speed of 5x10^6 m/s.
Thevoltage difference between the plates is 60V (see figurebelow).
Find the speed of the electron when it leaves theregion.

I was thinking that you might use the KE of the electron
(1/2mv^2)equals the EPE of the electron as it moves through the
plate.